From: Laurent Vivier <lvivier@redhat.com>
To: passt-dev@passt.top
Cc: Laurent Vivier <lvivier@redhat.com>
Subject: [PATCH v6 19/30] tap: Convert tap4_handler() to iov_tail
Date: Wed, 4 Jun 2025 15:08:23 +0200 [thread overview]
Message-ID: <20250604130834.3868010-20-lvivier@redhat.com> (raw)
In-Reply-To: <20250604130834.3868010-1-lvivier@redhat.com>
Use packet_data() and extract headers using IOV_PEEK_HEADER()
rather than packet_get().
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
tap.c | 33 ++++++++++++++++++++-------------
1 file changed, 20 insertions(+), 13 deletions(-)
diff --git a/tap.c b/tap.c
index 3f090e1bf65d..30031c6e514e 100644
--- a/tap.c
+++ b/tap.c
@@ -704,28 +704,34 @@ static int tap4_handler(struct ctx *c, const struct pool *in,
i = 0;
resume:
for (seq_count = 0, seq = NULL; i < in->count; i++) {
- size_t l2len, l3len, hlen, l4len;
+ size_t l3len, hlen, l4len;
+ struct ethhdr eh_storage;
+ struct iphdr iph_storage;
+ struct udphdr uh_storage;
const struct ethhdr *eh;
const struct udphdr *uh;
struct iov_tail data;
struct iphdr *iph;
- const char *l4h;
- packet_get(in, i, 0, 0, &l2len);
+ if (!packet_data(in, i, &data))
+ continue;
- eh = packet_get(in, i, 0, sizeof(*eh), &l3len);
+ eh = IOV_PEEK_HEADER(&data, eh_storage);
if (!eh)
continue;
if (ntohs(eh->h_proto) == ETH_P_ARP) {
PACKET_POOL_P(pkt, 1, in->buf, in->buf_size);
- data = IOV_TAIL_FROM_BUF((void *)eh, l2len, 0);
packet_add(pkt, &data);
arp(c, pkt);
continue;
}
- iph = packet_get(in, i, sizeof(*eh), sizeof(*iph), NULL);
+ if (!iov_tail_drop(&data, sizeof(*eh)))
+ continue;
+ l3len = iov_tail_size(&data);
+
+ iph = IOV_PEEK_HEADER(&data, iph_storage);
if (!iph)
continue;
@@ -753,8 +759,9 @@ resume:
if (iph->saddr && c->ip4.addr_seen.s_addr != iph->saddr)
c->ip4.addr_seen.s_addr = iph->saddr;
- l4h = packet_get(in, i, sizeof(*eh) + hlen, l4len, NULL);
- if (!l4h)
+ if (!iov_tail_drop(&data, hlen))
+ continue;
+ if (iov_tail_size(&data) != l4len)
continue;
if (iph->protocol == IPPROTO_ICMP) {
@@ -765,7 +772,6 @@ resume:
tap_packet_debug(iph, NULL, NULL, 0, NULL, 1);
- data = IOV_TAIL_FROM_BUF((void *)l4h, l4len, 0);
packet_add(pkt, &data);
icmp_tap_handler(c, PIF_TAP, AF_INET,
&iph->saddr, &iph->daddr,
@@ -773,15 +779,17 @@ resume:
continue;
}
- uh = packet_get(in, i, sizeof(*eh) + hlen, sizeof(*uh), NULL);
+ uh = IOV_PEEK_HEADER(&data, uh_storage);
if (!uh)
continue;
if (iph->protocol == IPPROTO_UDP) {
+ struct iov_tail eh_data;
+
PACKET_POOL_P(pkt, 1, in->buf, in->buf_size);
- data = IOV_TAIL_FROM_BUF((void *)eh, l2len, 0);
- packet_add(pkt, &data);
+ packet_data(in, i, &eh_data);
+ packet_add(pkt, &eh_data);
if (dhcp(c, pkt))
continue;
}
@@ -832,7 +840,6 @@ resume:
#undef L4_SET
append:
- data = IOV_TAIL_FROM_BUF((void *)l4h, l4len, 0);
packet_add((struct pool *)&seq->p, &data);
}
--
@@ -704,28 +704,34 @@ static int tap4_handler(struct ctx *c, const struct pool *in,
i = 0;
resume:
for (seq_count = 0, seq = NULL; i < in->count; i++) {
- size_t l2len, l3len, hlen, l4len;
+ size_t l3len, hlen, l4len;
+ struct ethhdr eh_storage;
+ struct iphdr iph_storage;
+ struct udphdr uh_storage;
const struct ethhdr *eh;
const struct udphdr *uh;
struct iov_tail data;
struct iphdr *iph;
- const char *l4h;
- packet_get(in, i, 0, 0, &l2len);
+ if (!packet_data(in, i, &data))
+ continue;
- eh = packet_get(in, i, 0, sizeof(*eh), &l3len);
+ eh = IOV_PEEK_HEADER(&data, eh_storage);
if (!eh)
continue;
if (ntohs(eh->h_proto) == ETH_P_ARP) {
PACKET_POOL_P(pkt, 1, in->buf, in->buf_size);
- data = IOV_TAIL_FROM_BUF((void *)eh, l2len, 0);
packet_add(pkt, &data);
arp(c, pkt);
continue;
}
- iph = packet_get(in, i, sizeof(*eh), sizeof(*iph), NULL);
+ if (!iov_tail_drop(&data, sizeof(*eh)))
+ continue;
+ l3len = iov_tail_size(&data);
+
+ iph = IOV_PEEK_HEADER(&data, iph_storage);
if (!iph)
continue;
@@ -753,8 +759,9 @@ resume:
if (iph->saddr && c->ip4.addr_seen.s_addr != iph->saddr)
c->ip4.addr_seen.s_addr = iph->saddr;
- l4h = packet_get(in, i, sizeof(*eh) + hlen, l4len, NULL);
- if (!l4h)
+ if (!iov_tail_drop(&data, hlen))
+ continue;
+ if (iov_tail_size(&data) != l4len)
continue;
if (iph->protocol == IPPROTO_ICMP) {
@@ -765,7 +772,6 @@ resume:
tap_packet_debug(iph, NULL, NULL, 0, NULL, 1);
- data = IOV_TAIL_FROM_BUF((void *)l4h, l4len, 0);
packet_add(pkt, &data);
icmp_tap_handler(c, PIF_TAP, AF_INET,
&iph->saddr, &iph->daddr,
@@ -773,15 +779,17 @@ resume:
continue;
}
- uh = packet_get(in, i, sizeof(*eh) + hlen, sizeof(*uh), NULL);
+ uh = IOV_PEEK_HEADER(&data, uh_storage);
if (!uh)
continue;
if (iph->protocol == IPPROTO_UDP) {
+ struct iov_tail eh_data;
+
PACKET_POOL_P(pkt, 1, in->buf, in->buf_size);
- data = IOV_TAIL_FROM_BUF((void *)eh, l2len, 0);
- packet_add(pkt, &data);
+ packet_data(in, i, &eh_data);
+ packet_add(pkt, &eh_data);
if (dhcp(c, pkt))
continue;
}
@@ -832,7 +840,6 @@ resume:
#undef L4_SET
append:
- data = IOV_TAIL_FROM_BUF((void *)l4h, l4len, 0);
packet_add((struct pool *)&seq->p, &data);
}
--
2.49.0
next prev parent reply other threads:[~2025-06-04 13:09 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-04 13:08 [PATCH v6 00/30] Introduce discontiguous frames management Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 01/30] arp: Don't mix incoming and outgoing buffers Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 02/30] iov: Introduce iov_tail_clone() and iov_tail_drop() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 03/30] iov: Update IOV_REMOVE_HEADER() and IOV_PEEK_HEADER() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 04/30] tap: Use iov_tail with tap_add_packet() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 05/30] packet: Use iov_tail with packet_add() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 06/30] packet: Add packet_data() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 07/30] arp: Convert to iov_tail Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 08/30] ndp: " Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 09/30] icmp: " Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 10/30] udp: " Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 11/30] tcp: Convert tcp_tap_handler() to use iov_tail Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 12/30] tcp: Convert tcp_data_from_tap() " Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 13/30] dhcpv6: move offset initialization out of dhcpv6_opt() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 14/30] dhcpv6: Extract sending of NotOnLink status Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 15/30] dhcpv6: Convert to iov_tail Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 16/30] dhcpv6: Use iov_tail in dhcpv6_opt() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 17/30] dhcp: Convert to iov_tail Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 18/30] ip: Use iov_tail in ipv6_l4hdr() Laurent Vivier
2025-06-04 13:08 ` Laurent Vivier [this message]
2025-06-04 13:08 ` [PATCH v6 20/30] tap: Convert tap6_handler() to iov_tail Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 21/30] packet: rename packet_data() to packet_get() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 22/30] arp: use iov_tail rather than pool Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 23/30] dhcp: " Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 24/30] dhcpv6: " Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 25/30] icmp: " Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 26/30] ndp: " Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 27/30] packet: remove PACKET_POOL() and PACKET_POOL_P() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 28/30] packet: remove unused parameter from PACKET_POOL_DECL() Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 29/30] packet: add memory regions information into pool Laurent Vivier
2025-06-04 13:08 ` [PATCH v6 30/30] packet: use buf to store iovec array Laurent Vivier
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